Anyone know of a post-apocalyptic movie with two types of people ruled over

[Jess Kill]

by two scientists? Now, I know this may sound strange, but this is actually a really good movie. Well, in my book anyways. I can't remember much, but what I do recollect is that this movie takes place in a post-apocalyptic world, where the last of the human race is separated into two types of people, who follow one of two scientist that took over as the leaders or the world. One race moved on to the plains and mountains, left civilization and technology behind and basically took on a medieval lifestyle and are peaceful. The others, stayed in the cities and became violent cyber-punk cannibals. To the best of my memory of the movie, I believe that the scientist the cannibals follow is evil and sent a virus or nuclear downfall, or something that you'd expect would cause an apocalypse, and have control over a metropolis, and vice versa for the medieval people. I believe, a band of the outsiders try and get into the metropolis for...whatever reason...I think it had to do with this girl's father or, I don't really remember. It is a recent movie, from 2002-20010 maybe? I'd really appreciate if somebody could tell me if they have an idea of it. Thank you for your time.